Fix Your Warm AC: Recharge Your Air Conditioner with Freon

With the can pierced, reattach the rubber hose to the low pressure port on the AC line. Start the engine and turn the AC onto high. Give the system a minute to pressure up, then turn the gauge counterclockwise to start releasing the R134 into the system. Watch the pressure gauge as you add refrigerant. The area of the gauge that corresponds to the outside temperature will tell you when the system is full. You can find more information in the instructions that came with the all-in-one recharge kit. As you add refrigerant and wait for the pressure to come up, slowly rotate the can back and forth to distribute the good stuff as it comes out.